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Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS DU-109-PP.

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Presentation on theme: "Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS DU-109-PP."— Presentation transcript:

1 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS DU-109-PP

2 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  PURPOSE  The purpose of the Operations and Maintenance Training Program is to train Operations and Maintenance Technicians in the operation of the Duke University Plant Heating, Ventilation, and Air Conditioning (HVAC) Systems.  OBJECTIVES  Trainees will demonstrate knowledge of – HVAC System Components – HVAC System Components Operation – HVAC System Configuration – HVAC System Controls and Instrumentation

3 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  PURPOSE  The purpose of the Heating, Ventilation, and Air Conditioning (HVAC) System is to: – Provide heat and cooling climate control for plant, office/control room, and electrical room areas of the steam and chiller plants – Maintain Interior Air Quality (IAQ) – Maintain air pressure – Provide emergency exhaust

4 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  HVAC AIR FUNCTIONS  To understand how HVAC works, you need to be familiar with the six functions of HVAC air.  Return Air – Air inside the building drawn back into the air handlers  Outside Air – Fresh air drawn into the air handlers from outside  Supply Air – Air blown into the building from the air handlers

5 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  HVAC AIR FUNCTIONS  Makeup Air – Air blown into the building by Makeup Air Unites (MAUs) to maintain air pressure balance when pressure is low  Relief Air – Air exhausted from the building to maintain air pressure balance when air pressure is high  Exhaust Air – Air expelled to remove contaminants from areas where chemicals, hazardous materials, and toxic gases are present – Air exhausted from the building in case of emergency

6 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  WHY AIR BALANCE IS IMPORTANT  Over Pressure and Under Pressure conditions negatively affect building efficiency.  Over Pressure – When air pressure inside a building is higher than pressure outside, the conditioned air inside the building is pushed outside. – High air pressure can require excess energy to condition the air in the building and compensate for energy lost.

7 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  WHY IS AIR BALANCE IMPORTANT?  Under Pressure – When building pressure is lower than pressure outside, the air outside is drawn inside. – Outside air may come from undesirable sources (trash bins, open doors, cracks, construction, and so forth). – Unfiltered or unconditioned air can affect the HVAC system’s ability to maintain the desired environment.

8 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  What does IAQ stand for? – International Air Quality – Industrial Air Quality – Interior Air Quality – In-duct Air Quality

9 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  IAQ stands for Interior Air Quality.

10 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  What kind of air is blown into building from air handlers? – Return Air – Outside Air – Makeup Air – Supply Air

11 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  Supply Air is recirculated through the air handlers.

12 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  What kind of air is added when air pressure is low? – Return Air – Outside Air – Makeup Air – Supply Air

13 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  Makeup Air is blown into a building when air pressure is low.

14 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  What causes Over Pressure? – Pressure is higher on the lower level than on the mezzanine – Pressure is lower in the building than outside – Pressure is higher in the building than outside – Pressure is lower on the lower level than on the mezzanine

15 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  Over Pressure is the condition when pressure inside the building is higher than outside.

16 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  What causes Under Pressure? – Pressure is higher on the lower level than on the mezzanine – Pressure is lower in the building than outside – Pressure is higher in the building than outside – Pressure is lower on the lower level than on the mezzanine

17 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  Under Pressure is the condition when pressure inside the building is lower than outside.

18 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  PLANT HVAC COMPONENTS  Air Handler Units (AHUs)  Makeup Air Units (MAUs)  Fan Coil Units (FCUs)  Exhaust fans  Supply fans  Emergency exhaust fans

19 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  AHU COMPONENTS  The Mixing Box section contains: – Return Air Damper which connects to the Return Air Duct The Relief Air Damper also connects to the Return Air Duct – Outside Air Damper which connects to the duct to the building exterior RETURN AIR DAMPER OUTSIDE AIR DAMPER RELIEF AIR DAMPER MIXING BOX

20 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  AHU COMPONENTS  The Filter section contains: – Access door for filter element replacement – W.C. Meter mounted in door Filter is replaced when air pressure reaches maximum resistance FILTER MIXING BOX RETURN AIR RELIEF AIR OUTSIDE AIR W.C. METER

21 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  AHU COMPONENTS  The Cooling Coil section contains: – In and Out connections for chilled water – Cooling coil heat exchanger MIXING BOX FILTERCOOLING COIL RETURN AIR RELIEF AIR OUTSIDE AIR

22 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  AHU COMPONENTS  The Heating Coil section contains: – In and Out connections for steam – Heating coil heat exchanger FILTER COOLING COIL HEATING COIL MIXING BOX RETURN AIR RELIEF AIR OUTSIDE AIR

23 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  AHU COMPONENTS  The Fan section contains: – Fan and motor – Starter Box mounted on exterior or nearby FILTERCOOLING COIL HEATING COIL MIXING BOX RETURN AIR OUTSIDE AIR

24 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  What is accomplished in the AHU mixing box? – Return air is mixed with relief air – Supply air is mixed with return air – Supply air is mixed with outside air – Return air is mixed with outside air

25 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  Return air is mixed with outside air in the AHU mixing box.

26 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  What kind of meter is mounted in the filter section door of an AHU? – Temperature sensor – Pressure gauge – W.C. meter – Anemometer

27 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  A W.C. meter is mounted in the door of the filter section. The W.C. (Water Column) meter measures resistance through the filter in inches to indicate when the filter needs to be changed.

28 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  Where is the starter box located for an AHU? – Exterior of the fan section or nearby – Mixing box – Control Room – AHUs do not need starters

29 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  The starter box is mounted on the fan section of the AHU or nearby.

30 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  MAU COMPONENTS  The Fan section contains: – Fan and motor – Outside Air Damper which connects to the duct to the building exterior OUTSIDE AIR DAMPER FAN

31 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  MAU COMPONENTS  The Coil section contains: – In and Out connections for steam and chilled water – Heating and cooling coil heat exchangers COOLING COIL HEATING COIL OUTSIDE AIR DAMPER FAN

32 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  MAU COMPONENTS  The Filter section contains: – Filters – Supply Air Damper COOLING COIL HEATING COIL OUTSIDE AIR DAMPER FAN FILTER SUPPLY AIR DAMPER

33 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  MAU COMPONENTS  The Starter box is located next to the MAU.

34 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  What is one way an MAU differs from an AHU? – The MAU takes in return air and outside air – The MAU takes in relief air only – The MAU takes in outside air only – The MAU takes in return air only

35 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  The MAU takes in outside air only.

36 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  What does MAU stand for? – Main Air Unit – Maximum Air Unit – Mini Air Unit – Makeup Air Unit

37 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  MAU stands for Makeup Air Unit.

38 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  What is another way an MAU differs from an AHU? – The MAU has a mixing box – The MAU does not have a mixing box – The MAU has a cooling coil – The AHU has a cooling coil

39 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  The MAU does not have a mixing box.

40 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  FCU COMPONENTS  Outside Air Damper  Electric Duct Heater SUPPLY AIR OUTSIDE AIR DAMPER RETURN AIR ELECTRIC DUCT HEATER

41 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  FCU COMPONENTS  Filter  Cooling Coil  Fan and Motor COOLING COIL FAN FILTER

42 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  What does the FCU use to heat supply air? – Steam – Hot water – Electricity – Friction

43 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  The FCU uses an Electric Duct Heater to heat air in the supply air duct.

44 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  What does FCU stand for? – Forced Cooling Unit – Facilities Control Unit – Furnace Coil Unit – Fan Coil Unit

45 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  FCU stands for Fan Coil Unit.

46 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  PLANT HVAC SYSTEMS CONFIGURATION AND PROCESS FLOW  The flow for Chiller Plant #2 is used as an example.

47 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-21 SYSTEM  Temperature Transmitters on the Return Air Duct, Supply Air Duct, and Mixing Box of AHU-21 send readings to the Local Controller Digital Control System (DCS). LOCAL CONTROLLER DCS RETURN AIR DUCT SUPPLY AIR DUCT MIXING BOX AHU-21

48 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-21 SYSTEM  The local DCS controls heating and cooling by modulating the Cooling Coil chilled water control valve and the steam valve supplying the Heating Coil. LOCAL CONTROLLER DCS MIXING BOX CHILLED WATER CONTROL VALVE STEAM VALVE COOLING COIL HEATING COIL

49 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-21 SYSTEM  The Outside Air Damper is set at 2,000 CFM.  The Return Air Damper is set at 30,000 CFM. MIXING BOXOUTSIDE AIR DAMPER D-21F SUPPLY AIR DAMPER D-21E AHU-21

50 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-21 SYSTEM  1,000 CFM exhausted continuously from Chemical Treatment area by Exhaust Fan EF-23.  350 CFM exhausted continuously from the Break Room, Men’s and Women’s Restrooms, Shower, and Janitor’s Closet by Exhaust Fan EF-24. BREAK ROOM WOMEN’S RESTROOM MEN’S RESTROOM JANITOR’S CLOSET SHOWER EXHAUST FAN EF-24 EXHAUST TO OUTSIDE LOUVER L-28

51 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-21 SYSTEM  Supply Fans SF-21 and SF-22 run continuously to recirculate air within the plant. SUPPLY FAN SF-21 SUPPLY FAN SF-22 EF-24 AHU-21

52 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-21 SYSTEM  Economizer Operation  Based on outside air enthalpy and outside air temperature, when less than 60°F AHU-21 operates in economizer cycle modulating the outside and return air dampers to maintain 60°F supply air temperature. LOCAL CONTROLLER DCS RETURN AIR DAMPER OUTSIDE AIR DAMPER

53 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-21 SYSTEM  Economizer Operation  The chilled water valve to AHU-21 is closed during economizer cycle.  In the event of damper failure or mixed air temperature below 35°F, a freezestat shuts down AHU-21 and sends an alarm. LOCAL CONTROLLER DCS FREEZESTAT CHILLED WATER VALVE

54 Facilities Management Utilities & Engineering Services Duke RELIEF DAMPER RD-21 PRESSURE SENSOR A7 AT 0.05” W.C. AHU-21 PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-21 SYSTEM  Economizer Operation  Relief Air Damper RD-21 is controlled by differential pressure to maintain a 0.05 inch W.C. positive pressure in the building by modulating the damper.

55 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-21 SYSTEM  Emergency Exhaust  During emergency when refrigerant accumulates above 100 PPM due to leak or rupture, air recirculation dampers to Exhaust Fans EF-21 and EF-22 close and exhaust dampers open forcing the refrigerant from the building. NORTH EMERGENCY EXHAUST EF-21 SOUTH EMERGENCY EXHAUST EF-22 EMERGENCY EXHAUST DAMPER L-26 EMERGENCY EXHAUST DAMPER L-25

56 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-21 SYSTEM  Emergency Exhaust  Supply Fans SF-21 and SF-22 shut down.  The outside air damper to AHU-21 opens fully and the return air damper closes.  Additional outside air (30,000 CFM) brought into the building from AHU-21 is exhausted through Positive Relief Damper RD-1.  When the refrigerant detectors no longer sense a low refrigeration concentration of 100 PPM, exhaust air dampers to EF-21 and 22 close and the air recirculation dampers open. SF-21 and 22 then energize and AHU-21 returns to a modulating damper cycle.

57 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-21 SYSTEM  Emergency Exhaust  If an emergency occurs when the supply air temperature is less than 60°F, a temperature sensor opens steam valve TCV-AHU-21B to maintain a supply air temperature of 60°F.

58 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  Based on outside air enthalpy and outside air temperature, what is the lowest temperature at which AHU-21 will operate before entering the economizer cycle? – 80°F – 40 °F – 60 °F – 72°F

59 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  Based on outside air enthalpy and outside air temperature, when less than 60°F AHU-21 operates in economizer cycle.

60 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  When do Supply Fans SF-21 and SF-22 run? – Only when building pressure is low – Continuously – Only when building pressure is high – Only at night

61 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  Supply Fans SF-21 and SF-22 run continuously to recirculate air within the plant.

62 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  Where do the temperature transmitters on the ducts and mixing box on AHU-21 send readings? – Local Controller DCS – AHU-22 – Directly to the Control Room – Chiller Plant #1

63 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  Temperature Transmitters on the Return Air Duct, Supply Air Duct, and Mixing Box of AHU-21 send readings to the Local Controller Digital Control System (DCS).

64 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-22 SYSTEM  AHU-22 supplies 10,000 CFM of cooling to the Electric Room.  The local DCS modulates the cooling coil chilled water valve in response to temperature sensors in the supply and return air ducts and mixing box. LOCAL CONTROLLER DCS COOLING COIL COOLING COIL CHILLED WATER VALVE TCV-AHU- 22A

65 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-22 SYSTEM  The Outside Air Damper is set at 9,940 CFM.  60 CFM is exhausted continuously through the Gravity Relief Damper in the mezzanine floor. GRAVITY RELIEF DAMPER RD-22 AHU-22 OUTSIDE AIR DAMPER L-23

66 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-22 SYSTEM  Economizer Operation  Based on outside air enthalpy and outside air temperature, when less than 60°F AHU-22 operates in economizer cycle modulating the outside and return air dampers to maintain 60°F supply air temperature. LOCAL CONTROLLER DCS RETURN AIR DAMPER OUTSIDE AIR DAMPER

67 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-22 SYSTEM  Economizer Operation  Relief Air Damper RD-21 is controlled by differential pressure to maintain a 0.05 inch W.C. positive pressure in the building by modulating the damper. RELIEF DAMPER RD-21 PRESSURE SENSOR A7 AT 0.05” W.C. AHU-22

68 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 AHU-22 SYSTEM  Economizer Operation  The chilled water valve to AHU-22 is closed during economizer cycle.  In the event of damper failure or mixed air temperature below 35°F, a freezestat shuts down AHU-22 and sends an alarm. LOCAL CONTROLLER DCS FREEZESTAT CHILLED WATER VALVE

69 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  What area is cooled by AHU-22? – Control Room – Janitor’s closet – Chemical Treatment Area – Electric Room

70 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  AHU-22 cools the Electric Room.

71 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  Where Is the Gravity Relief Damper located? – Control Room – Mezzanine floor – Electric Room – Operating floor

72 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  The Gravity Relief Damper is in the mezzanine floor.

73 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  What volume of cooling air is supplied to the Electric Room by AHU-22? – 1,250 CFM – 2,000 CFM – 10,000 CFM – 30,000 CFM

74 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  AHU-22 supplies 10,000 CFM of cooling to the Electric Room.

75 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 FCU-21 SYSTEM  FCU-21 supplies 1,285 CFM of cooling to the Control Room, break room, office, and vestibule.  Cooling is controlled by modulating the cooling coil chilled water valve in response to a temperature sensor in the Control Room. LOCAL CONTROLLER DCS COOLING COIL COOLING COIL CHILLED WATER VALVE FCU-21A CONTROL ROOM

76 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  CHILLER PLANT #2 FCU-21 SYSTEM  Outside air is set at 175 CFM during cooling with 1,110 CFM of return air.  Heating is provided by a 6 KW Electric Duct Heater located in the supply air duct. FCU-21 ELECTRIC DUCT HEATER DH-21

77 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  Where is the Electric Duct Heater located? – In the return air duct – In the supply air duct – In the relief air duct – In the makeup air duct

78 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  The Electric Duct Heater is located in the supply air duct.

79 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  Which of the following areas is cooled by FCU-21? – Operating floor – Chemical treatment area – Electric Room – Control Room

80 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  FCU-21 supplies cooling to the Control Room, break room, office, and vestibule.

81 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  OPERATIONS MONITORING – Operation of the Plant HVAC Systems is monitored through the Control Room on the top floor of Chilled Water Plant #2.

82 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  PLANT ROUNDS – During an Operator’s routine shift, Rounds are accomplished to record key information and visually assess HVAC Water System operation. – Each Plant has a Rounds Sheet to be filled out by the Operator. – Each plant has different requirements for plant rounds. – The information is recorded, not only for the current status, but also to record system trends.

83 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  EXAMPLE ROUNDS SHEET (front and back)

84 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  HVAC DAILY ROUNDS – Chiller Plants #1 and #2 Outside temperature Outside humidity Outside enthalpy AHU (On/Off) Supply Fans (On/Off) Exhaust Fans (On/Off)

85 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  HVAC DAILY ROUNDS – West and East Campus Steam Plants Outside temperature AHU Online/Offline Space temperature Supply air temperature Supply Fan Online/Offline Space temperature Supply air temperature

86 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  HVAC DAILY ROUNDS – West and East Campus Steam Plants Exhaust Fan (not all exhaust fans are checked for all conditions) Online/Offline Space temperature Supply air temperature Firm alarm OK Gas alarm OK E-Stop alarm OK

87 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  TYPICAL PROBLEMS ASSOCIATED WITH PLANT HVAC SYSTEMS – Stuck dampers Most likely cause is corrosion or debris – Blocked coils Most likely cause is corrosion, faulty filters – Malfunctioning control components Components damaged or out of calibration – Clogged condensate drains Most likely cause is debris or damage to pipes

88 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  Where does Operations Monitoring take place? – Control Room in each steam plant – Control Room in West Campus Steam Plant – Control Room in Chilled Water Plant #2 – Control Room in Chilled Water Plant #1

89 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  Operations Monitoring takes place In the Control Room in Chilled Water Plant #2.

90 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  QUESTION  Which air pressure condition in a building is preferable? – Under Pressure – Over Pressure – Balanced – Air pressure is not a concern of HVAC

91 Facilities Management Utilities & Engineering Services Duke PLANT HVAC SYSTEMS  ANSWER  Operations Monitoring takes place In the Control Room in Chilled Water Plant #2.


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